Structure for mounting an electromagnet in an electromagnetically operated switch

ABSTRACT

A structure for mounting an electromagnet in an electromagnetically operated switch. The structure includes a metal shock plate which is mounted on four posts that extend from a front surface of an insulated base whereon the stationary contacts of the switch are mounted. The front face of the shock plate has a mounting surface whereon an elastomeric pad is positioned and four spaced raised fingers which provide support surfaces along opposite sides of the mounting surface. The raised fingers provide a mounting for a pair of L-shaped members that are secured to each other and to the fingers to provide a frame that surrounds a stationary magnet when a rear wall of the magnet is positioned on the elastomeric pad. The magnet has projections on each of its opposite ends which provide a surface whereon elastomeric pads are positioned. The L-shaped members each have one leg resting on the elastomeric pads located on the projections so that the magnet is resiliently mounted on the shock plate. The L-shaped members also have openings therein which receive projections on a magnet coil to position the coil on the magnet and portions which guide the movement of an armature when the electromagnet is energized.

[ 1 Feb. 15, 1972 United States Patent Puetz et al. I

[57] ABSTRACT A structure for mounting an electromagnet in anelectromagnetically operated switch. The structure includes a metal [54]STRUCTURE FOR MOUNTING AN ELECTROMAGNET IN AN ELECTROMAGNETICALLYOPERATED SWITCH [72] Inventors:

shock plate which is mounted on four posts that extend from a frontsurface of an insulated base whe Jordan Puetz M'lwaukee James tacts ofthe switch are mounted. The

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plate has a mounting surface whereon an elastomeric positioned and fourspaced raised fin port surfaces along opposite sides of the mountin Theraised fingers provide a mountin members that are secured to each otherand to the tin provide a frame that surrounds a stationar rear wall ofthe magnet is positioned on th The magnet has projections on each of its0 provide a surface whereon elastomeric The L-shaped members each haveon elastomeric pads located on the is resiliently mounted on the sh bersalso have openings therein whi magnet coil to position the coil 0 whichguide the movement of an armatu tromagnet is energized.

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JORDAN F. PUETZ JAMES E.STALLMAN PATENTEDFEB 15 I972 SHEET 3 BF 3INVENTOR.

JORDAN F. PUETZ JAMES E. STALLMAN BY 2 Z STRUCTURE FORMOUNTING ANELECTROMAGNET IN AN ELECTROMAGNETICALLY OPERATED SWITCH The presentinvention relates to electromagnetically operated switching devices andparticularly to a structure for supporting an electromagnet in anelectromagnetically operated switch.

Electromagnetic switching devices, of the type with which the presentinvention is concerned, are commonly known as contactors and arefurnished as switching units of various sizes, having ratings which arenormally in accordance with the standards promulgated by the NationalElectrical Manufacturers Association, commonly known as NEMA. Among thecommercial requirements which a contactor is required to satisfy arethat the contactor must be constructed so it can be easily mounted andwired on a panel and that the parts of the contactor be arranged so itis easy to inspect and replace the various components, such as theswitching contacts and coil of the contactor, while the contactor iswired on the panel.

In larger sized contactors, i.e., NEMA Size 5 contactors which are ratedto carry 300 amperes or less, a magnet of considerable size and weightis required to exert the force required to cause a proper engagementbetween the movable and the stationary contacts of the contactor. Thus,from a design standpoint, the relatively heavy magnet in the contactorshould be located as close as possible to the panel. However, presentcommercial requirements dictate that the most desirable form of acontactor should have its line or supply 'wire connections at the top ofthe device and the load wire connections at the bottom of the device toprovide an arrangement which is commonly termed as straight-thru wiring.Further, the commercial requirements dictate that the wire connectingterminals be freely accessible and located as close to the panelaselectrical clearance requirements will permit. Thus, if a contactor isto have a simple economical construction, a minimum size for its ratedcapacity, and is to include a straight-thru wiring feature, the designrequirements dictate that it is impracticalto mount the magnet portionof the ,contact directly on the panel. Therefore, in the deviceaccording to the present invention, the magnet is carried forwardly ofthe base which supports the stationary contacts and wire connectingterminals so that the device may be readily wired on the panel withstraight-thru wiring and may be readily disassembled to permit themovable and the stationary contacts to be serviced. Further, in thecontactor according to the present invention, the magnet armature isarranged to move toward the base when the electromagnet is energized toprovide an economical simplified contactor structure. As the contactorconstruction herein described is intended for the larger size NEMA rateddevices, it necessarily includes a relatively heavy armature whichgenerates a considerable impact shock when the electromagnet isenergized. The undesirable effects of the impact shock are minimized bya structure which includes a shock plate which supports theelectromagnet and is mounted on four sturdy posts that extend from themolded base of the contactor. The four posts have inserts molded thereinwhich extend to the mounting panel so that the shock accompanying theengagement between the annature and stationary magnet part is directlytransmitted to the mounting panel and in effect bypasses the base.Further, a molded barrier which encloses the contacts so as to isolatethe poles of the contactor from each other and ground is suspended fromthe shock plate so as to be out of engagement with the base. Thus theshock is not transmitted through the barrier to the base and theinspection and servicing of the contact structure is readilyaccomplished by merely removing the screws securing the shock plate tothe posts so that the entire assembly, including the electromagnet andbarrier, may be removed to make the contacts of the structure readilyaccessible. The structure for mounting the electromagnet on the shockplate includes a pair of members which are secured to each other and tofingers that extend from the forward surface of the shock plate. Thepair of members provide a rectangular frame that surrounds thestationary magnet and provide an arrangement whereby the coil may bereadily removed for replacement purposes. The members further provide aguide for the armature and a structure for resiliently supporting thestationary magnet so the magnet has a limited movement on the shockplate to reduce the noise when pole faces of the armature and magnet arein engagement with each other and the shock which accompanies the impactbetween the armature and the stationary magnet when the electromagnet isinitially energized.

It is an object of the present invention to resiliently mount anelectromagnet structure of a contactor on a metal plate which issupported on posts which extend forwardly of a molded base carrying thestationary contacts of the contactor with a means that include a pair ofL-shaped members that are secured to each other and to fingers whichextend from a front surface of the metal plate.

Another object is to resiliently mount an electromagnet structure of acontactor on a metal plate with a means that includes a pair of L-shapedmembers that provide a frame that is spaced forwardly of the frontsurface and surrounds a stationary magnet portion of the electromagnetwhen the members are secured to fingers extending forwardly of the frontsurface and to provide the members with openings which receiveprojections on a magnet coil portion of the electromagnet to positionthe coil on the magnet and portions which guide the armature portion ofthe electromagnet during the movement of the armature toward thestationary magnet.

An additional object is to mount an electromagnet structure of acontactor on a metal plate with a means that includes a pair of L-shapedmembersthat provide a frame that is spaced forwardly of the frontsurface of the metal plate and engages side and end wall portions of astationary magnet portion of the electromagnet to position the magnet onthe plate and to provide the members with openings which receiveprojections on a magnet coil portion of the electromagnet to positionthe coil on the magnetand portions which guide the armature portion ofthe electromagnet during its movement toward the magnet and to providean elastomeric pad between a rear surface on themagnet and the metalplate and elastomeric pads between projections on the magnet armportions of the pair of members so the magnet is resiliently mounted onthe plate to have limited movement to reduce the shock and the noisegenerated between the armature and magnet when the coil is energized.

A still further object is to resiliently mount an electromagnetstructure of a contactor on a metal plate which is supported on postswhich extend forwardly of a molded base carrying the stationary contactsof the contactor with a means that includes a pair of L-shaped membersthat provide a frame that is spaced forwardly of the front surface ofthe plate and engages side and end wall portions of a stationary magnetportion of the electromagnet to position the magnet on the plate and toprovide the members with openings which receive projections on a magnetcoil portion of the electromagnet to position the coil on the magnet andportions which guide the armature portion of the electromagnet duringits movement toward the magnet and to provide an elastomeric pad betweena rear surface on the magnet and the metal plate and elastomeric padsbetween projections on the magnet and arm portions of the pair ofmembers so the magnet is resiliently mounted on the plate to havelimited movement to reduce the shock and the noise generated between thearmature and magnet when the coil is energized and to maintain theposition of the coil on the magnet by resilient supports that arecarried by a cover portion of the contactor.

Further objects and features of the invention will be readily apparentto those skilled in the art from the specification and appended drawingsillustrating certain preferred embodiments in which:

FIG. 1 is an end view of an electromagnetically operated switchingdevice incorporating the features of the present invention.

FIG. 2 is a front'view of the switching device in FIG. 1 with a cover,an armature and a magnet coil removed to illustrate a mounting for astationary magnet portion of the device.

FIG. 3 is a view of the device in FIG. 2 with the magnet coil installed.I

FIG. 4 is a perspective view of the magnet coil and a pair of L-shapedmembers which are included in the switching device in FIG. 1.

FIG. 5 is an exploded view showing in perspective a metal mountingplate, a stationary magnet part, a pair of assembled L-shaped members, amagnet coil, an armature assembly and a cover which are included in theswitching device in FIG. 1.

For the convenience in description, the electromagnet switch oncontactor is described herein as disposed in a horizontal position whenthe contactor is mounted on a front wall of a vertical panel, the partsof the contactor being described in relation to this position.Accordingly, the terms front and rear, upper and lower, vertical andhorizontal and the like are not absolute but merely define more readilythe relative positions of portions of the parts and their relativepositions to each other when the contactor is mounted on a panel.

Referring to FIG. 1 of the drawings, an electromagnetic switch assemblyis shown as having a plurality of components that are stacked one uponthe other. The components of the assembly 10 include a metal mountingplate 12, an insulating base 14, an insulating barrier 16, a shock plate18, an electromagnetic assembly 20, a cover 22 and a movable contactcarrier 24.

As disclosed in an application for U.S. Pat. having a Ser. No. 996I3,concurrently filed herewith, the contactor structure is arranged so thatthe shock plate 18 rests on four posts which extend forwardly of thebase 14. The shock plate 18 mounts the barrier 16 in spaced relation tothe base 14 to provide easy access to the movable and stationary contactstructures of the device and transmits the magnet closing shock directlythrough the four posts to the mounting plate 12. Similarly, the detailsof the cover 22 and arrangement for connecting the armature of theelectromagnetic assembly to the contact carrier 24 are respectivelyshown in applications for U.S. Pat., Ser. Nos. 99573 and 99574, whichare similarly concurrentlyfiled herewith.

As shown in FIGS. 1 and 2, the metal mounting plate 12 is formed as astamped metal part to provide a means to secure the switch assembly 10to a vertical panel and the like, not shown. When the plate 12 issecured to the panel, an edge 26 becomes the bottom edge of the plate 12and a surface 28 the front surface of the plate 12. The plate 12 has apair of rearwardly extending indentations 30 along its bottom edge 26that provide a pair of spaced mounting feet having opening therein. Theplate 12 also has an indentation 32 at its top edge which provides anelongated mounting foot having an opening therein which, together withthe indentations 30, are provided forthe purpose of securing the plate12 to a vertical panel.

The switch 10 is a three pole device, in that it is capable ofcompleting and interrupting a three phase circuit when the switch 10 isactuated and deactuated. To enable the switch 10 to function as athree-pole device, the base 14 and the barrier 16 are formed of a moldedinsulated material having arc suppressing capabilities and cooperatewith each other to provide three compartments which extend parallelbetween the top and bottom of the switch 10. Positioned in eachcompartment is a set of stationary contacts and a movable contact in amanner disclosed in an application for U.S. Pat., Ser. No. 99612,concurrently filed herewith. Extending into the material of the baseforwardly of a rear surface 34 and to the sidewalls of the base 14 is aslot. The slot is centered on a centerline equidistant between a topwall 36 and a bottom wall 38 of the base 14 and is exposed to each ofthe compartments by a passage. Positioned on opposite sides of thecenterline of the base in each of the compartments is a pair ofstationary contact assemblies which are respectively connected toterminal members 40. The terminal members 40 are arranged to accept thebared end of a wire conductor and are electrically connected to thestationary contacts within the compartments. The movable contact carrier24 is generally U-shaped having a bight or body portion received in theslot, and a pair of arm portions 42 extending extemally of the sidewallsof the base 14 and barrier 16. The arm portions 42 are connected to anarmature 44 of the electromagnetic assembly 20 and are moved rearwardlytoward the plate 12 when the electromagnet assembly 20 is energized. Atleast one pair of compression springs 46 positioned between a rear wallof the bight portion on the contact carrier 24 and the plate 12 causethe movable contact carrier 24 to be positioned forwardly when theelectromagnetic assembly 20 is deenergized. Extending from the bightportion of the contact carrier 24 into each of the compartments is aprojection which provides a mounting for a movable contact and thespring biased releasable retainer for the movable contact in a mannerfully disclosed in the application for U.S. Pat. Ser. No. 99612, supra.

Extending forwardly from a front surface on the base 14 are four spacedposts 48 each of which has a front surface 50 that is spaced from theremaining front surface portions of the base 14. The posts 48, which aremore clearly described in the application for Us. Pat. Ser. No. 99613,supra, have metal inserts embedded therein that have a rear end flushwith a rear surface 34 of the base 14 and extend substantiallythroughout the molded material of the posts 48. The inserts havethreaded bores at their opposite ends which are respectively used tomount the base 14 on the metal mounting plate 12 and receive screws 52at their forward end which mount the shock plate 18 on the frontsurfaces 50.

The shock plate 18 is formed as a metal plate having a thickness so itwill resist deformation when it is mounted on the surfaces 50 providedby the four spaced posts 48. The posts 48 extend from the front surfaceof the base 12 so two of the posts 48 are on each side of a plane thatis normal to and passes through the horizontal center of the base 14. Asmost clearly seen in FIG. 5, the shock plate l8 has a front surface 54and a rear surface 56 and four openings 58 located therein to be alignedwith the threaded bores in the four posts 48 when the rear surface 56 ispositioned on the front surfaces 50. The shock plate 18 is mounted onthe front surface 50 in spaced relation to the front surface of the baseby the four screws 52 which pass through the openings 58 and arethreaded into the inserts in the posts 48. The shock plate 18 has anadditional four spaced openings 60 which receive four screws 62 to mountthe barrier 16 on the rear surface 56. The barrier 16 has suitableinserts molded therein to receive the screws 62 so as to be suspended onthe shock plate 18 with all the portions of its rear surface in spacedrelation to the front surface portions of the base 14.

The front surface of the barrier 16 and the rear surface 56 of the shockplate 18 are shaped relative to each other so that the only areas ofcontact existing between the barrier 16 and shock plate 18 occur wherethe portions of the shock plate 18 surrounding the openings 58 engagethe portions of the barrier 16 which surround the inserts receiving thescrews 62. Thus in effect the barrier 16 is suspended in spaced relationto the shock plate 18.

A rectangularly shaped central portion of the front surface 54-thatextends between the opposite sidewalls of the barrier provides amounting surface 68. The mounting surface 68 is rectangular in shape.Extending upwardly and downwardly from opposite sides of the mountingsurface 68 are portions 70 and 72 wherein the openings 58 and 60 arelocated. The portions 70 and 72 are winglike in shape and extend fromopposite sides of the mounting surface 68 so the front surface of themounting surface 68 is rearwardly of the front surfaces of the portions70 and 72 whereby the mounting surface 68 simulates a rearwardlydepressed portion in the front surface 54. Extending upwardly at theends of the upper side of the rectangular mounting surface 68 are a pairof forwardly and upwardly extending fingers 74. Similarly extendingdownwardly at the ends of the lower side of the mounting surface 68 area pair of forwardly and downwardly extending fingers 76. The fingers 74and 76 each have an inclined portion 78 extending forwardly from thefront surface to present support surface portions 80 that are spacedfrom each other and extend in a plane that is parallel and spacedforwardly of the mounting surface 68. Each of the support surfaces 80has a threaded opening 82 therein. A pad 84, formed of a suitableelastomeric material, such as Buna N rubber, is secured on the mountingsurface 68 to have its front surface substantially flush with the frontsurfaces of the portions 70 and 72.

In addition to the armature 44, the electromagnet assembly includes astationary magnet part 86 and a magnet coil 88. The stationary magnet 86in the form shown is E-shaped and formed of a stack of E-shapedlaminated magnet iron pieces which are positioned between a pair ofE-shaped nonmagnetic iron plates which are secured together bystrategically located rivets to provide a unitary assembly in a mannerwell known to those skilled in the art. The magnet 86 has a rear wall90, a pair of sidewalls 92 and 94, a pair of end walls 96 and 98 and isshaped to provide poles 99 and 101 at its opposite ends having forwardlyfacing pole faces 100 and 102 thereon and a center pole 103 that islocated centrally between the poles 99 and 101 which provides a centerpole face 104. The poles 99 and 101 are suitably grooved to receiveshading coils 106. The end walls 96 and 98 are respectively shaped toprovide a projection 107 that presents forwardly facing support surfacesat the opposite ends of the magnet 86 whereon pads 112 and 114 arerespectively positioned. The pads 112 and 114 are formed of a suitableelastomeric material, such as Buna N rubber, and are located on thesupport surfaces on the projections 107 so as to extend in a plane thatis spaced forwardly of the rear wall 90.

A means for mounting the stationary magnet 86 on the elastomeric pad 84,positioning the magnet coil 88 on the stationary magnet 86 and guidingthe annature 44 during its movements includes a pair of members 116 and118 which are secured to each other and to the front surface of theshock plate 18, as will now be described. The members 116 and 118 areidentical and are each formed as a metal part to have a L- shape to havea first leg portion 120 and a second leg portion 122 which are arrangedto provide a rectangular frame when an end portion 124 on the free endof the leg 120 is secured to an end portion 126 on the free end of theleg 122. The end portions 124 are formed to overlay the end portions 126in a manner so the rear surfaces on the members extend in a commonplane. The end portions 124 and 126 have openings 128 therein and thelegs 120 have an opening 130 therein. The openings 128 and 130 arelocated in the members 116 and 118 so as to be aligned with the threadedopenings 82 when the rear side of the members 116 and 118 are positionedon the four support surfaces 80 provided by the two pairs of fingets 74and 76 to permit the members 116 and 118 to be secured to the shockplate 18 by screws 132 which are threaded into the openings 82.

The members 116 and 118 when secured to the shock plate will provide aframe 134 which is spaced forwardly of the shock plate and surrounds themagnet 86. The leg portions 120 on the members 116 and 118 have a pairof projections 136 which engage the sidewalls 92 and 94. Similarly, theleg portions 122 on the members 116 and 118 each have a projection 137extending to engage the end walls 96 and 98 that are disposed forwardlyof the pads 112 and 114 to position the magnet 86 against movement in adirection parallel to the mounting surface 68. When the members 116 and118 are mounted on the fingers 74 and 76, the rear surface on the legportions 122 will be positioned against the forward facing surface onthe elastomeric pads 112 and 114 so the magnet 86 will be resilientlymounted against movement in a direction vertical to the mounting plate12 by the elastomeric pads 84 and the elastomeric pads 112 and 114. Thelegs 120 of the members 116 and 118 each have a pair of openings 138therein and the legs 122 of the members 116 and 118 each have a portion140 that extends forwardly from the portion whereon the projection 137is formed. The function of the openings 138 and the portions 140 will behereinafter described.

The magnet coil 88 is formed as an encapsulated molded body which has acoil winding embedded therein connected to input terminals 142 which areexternally accessible on a front side 144 of the coil 88. The moldedbody forming the coil 88 has arear side 146 and a rectangularly shapedpassage 148 extending between the rear side 146 and the front side 144.The passage 148 is sized to receive the center pole 103 of the magnet.Additionally, the coil has four mounting pads located at the comers of arectangle extending from its rear surface. These pads, which are locatedat the opposite corners of the rectangle, have projections extendingtherefrom, two of which are indicated by a numeral 150 in FIG. 4. Theprojections 150 have tapered ends and are located on the rear side 146to be received in the openings 138 to position the coil 88 againstmovement in a plane parallel to the mounting plate 12 while the padsengaging the front surface of the members 116 and 118 position the coilagainst rearward movement in the switch 10. Thus the members 116 and 118position the coil 88 against movement in any of three directions. Thecoil.88 is formed so as to surround the center pole 103 and be receivedin the spaces between the center pole 103 and the poles 99 and 101.

The details of the armature 44 and its attachment to the movable contactcarrier 24 are clearly set forth in the U.S. Pat. application, Ser. No.99574. The armature 44 includes a stack of laminated magnet iron pieces152 which are positioned between a pair of nonmagnetic metal parts 154.The laminated pieces'152 and the parts 154 are secured together bystrategically located rivets 156 and are shaped to provide pole faces158 and 160 at the opposite ends of the metal pieces 152 which engagethe pole faces 100 and 102 respectively when a center pole face 162 isaligned with the center pole face 104. Secured at the opposite ends ofthe armature are a pair of molded members 164. The members 164 aresecured to the free end of the arm portion 42 of the movable contactcarrier 24 in a manner disclosed in application for U.S. Pat.application, Ser. No. 99574, supra. Each of the molded members 164 hasan arcuately shaped surface 166 positioned adjacent the portions 140 onthe members 116 and 118. The portions 140 have surfaceareas 168 whichare arranged to be engaged by portions of the arcuately shaped surface166 to guide the movement of the armature 44 along an axis that isparallel to the top and the bottom walls 36 and 38 and perpendicular tothe surface 28.

Extending forwardly from the front face of the barrier are four posts170, each of which has a front surface in a plane that is spacedforwardly and parallel to the front side 144 of the coil 88. The posts170 each have a threaded insert embedded therein which are exposed atthe front end of the posts 170 and are located to provide guide surfaces172 which are located to be engaged by surface portions on the upper andlower sides of the members 164 to guide the armature 44 during itsmovements. The cover 22, which is more fully described in theapplication for U.S. Pat, Ser. No. 99573, is formed from a metal pieceas a U-shaped channel having a pair of outwardly extending flanges 174at the ends of the arms 176 forming the U-shaped channel. The flanges174 have openings therein to receive screws 178 which secure the cover22 to the front surfaces of the posts 170 when the screws 178 arethreaded into the inserts within the posts 170. Each of the flanges 174has an opening therein which positions a springbiased plunger 180 whichhas its rear end positioned against the front side 144 of the coil 88when the cover 22 is secured on the posts 170. The plungers 180 carriedby the cover 22 resiliently maintain the coil 88 against movement in aforward direction from its position on the members 1 16 and 118. Thus itis apparent that the shock plate 18 and the members 116 and 118 providea mounting for the stationary magnet 86 without requiring mounting feetor cars on the stationary magnet 86 which are conventionally used indevices of the type herein described. Further, upon energization of themagnet coil 88, the shock accompanying the engagement between the polefaces 100 and 102 with the pole faces 158 and 160 will be initiallyabsorbed by the elastomeric pad 84 and then transmitted through thefingers 74 and 76 to the shock plate 18. Further, when the magnet coil88 is initially energized, the stationary magnet 86 will tend to movetoward the armature 44 while the armature 44 is being attracted towardthe stationary magnet 86. The elastomeric pads 112 and 114 permit aslight movement of the stationary magnet 86 toward the armature 44 tofurther dampen the shock when the pole faces on the armature 44 engagethe pole faces on the stationary magnet 86.

Further access to the coil may be readily obtained by removing the fourscrews 178 so the cover 22 may be detached from the barrier 16 andremoving two screws 182 which extend through the members 164 and arethreaded into inserts which are embedded in the end portions of the arms42 so the armature 44 may be detached from the contact'carrier 24. Thedetached cover 22 and armature 24 will expose the coil 88 so it can beremoved from its position on the members 116 and 118 so the switchassembly will appear as in FIG. 3. When the coil 88 is replaced in amanner previously described, the switch assembly will appear as in FIG.2 and the replacementof the armature 24 and cover 22 as described willcomplete the reassembly of the switch assembly 10.

The embodiments of the invention in which an exclusive property orprivilege is claimed are defined as follows:

1. In, an electromagnetically operated switch, the combinationcomprising: an insulating base having a front surface, a metal shockplate having a rear surface mounted on the base in spaced relation tothe front surface of the base, and a front surface providing a mountingsurface, an electromagnet ineluding a stationary magnet, a movablearmature and a magnet coil, and a means for mounting the stationarymagnet on the mounting surface, positioning the magnet coil on thestationary magnet and guiding the armature in its movement intoengagement with the stationary magnet, said means including a pair ofmembers secured to each other and to the front surface of the shockplate to provide a rectangular frame that is spaced forwardly of themounting surface and surrounds the stationary mag'net, said members eachhaving an opening therein receiving a projection on the coil forpositioning the coil on the stationary magnet and a surface engaging aportion that is movable with the armature to guide the armature duringits movement.

2. The combination as recited in claim 1 wherein the stationary magnethas a pair of sidewalls, a pair of end walls, a rear wall, a front endproviding a pair of forwardly facing pole faces at the opposite ends ofthe front end and a forwardly facing support surface extending outwardlyfrom each end wall, the pair of members that provide the frame areL-shaped each have a first leg portion wherein the coil positioningopening is located and a second leg portion providing the surface forguiding the armature movement and wherein the combination includes anelastomeric pad that is positioned between the rear wall on the magnetand the mounting surface on the shock plate, and an elastomeric pad oneach forwardly facing support surface on the magnet that is positionedbetween the forwardly facing support surface and the second leg portionof one of the pair of L-shaped members.

3. The combination as recited in claim 2 wherein the mounting surface onthe shock plate has a pair of opposite sides and a pair of raised spacedsupport surfaces extend from the front surface of the shock plateadjacent each of the opposite sides of the mounting surface.

4. The combination as recited in claim 3 wherein each of the supportsurfaces are provided by struckout portions in the shock plate thatextend forwardly from the front surface of the shock plate.

5. The combination as recited in claim 4 wherein each of the struckoutportions includes a portion that is inclined relative to the mountingsurface and a support portion that extends in a plane that is paralleland spaced forwardly of the mounting surface and each of the supportportions has a threaded opening therein which receives a screw to securethe pair of L-shaped members to each other and to the front surface ofthe shock plate.

6. The combination as recited in claim 5 wherein the shock plate ismounted on four posts that extend forwardly of the front surface of thebase.

7. The combination as recited in claim 6 wherein the first and thesecond leg portions have projections extending therefrom whichrespectively engage the side and the end walls of the stationary magnet.

8. The combination as recited in claim 2 wherein the shock plate ismounted on four posts that extend forwardly of the front surface of thebase.

9. The combination as recited in claim 2 wherein the first and thesecond leg portions have projections extending therefrom whichrespectively engage the side and the end walls of the stationary magnet.

10. The combination as recited in claim 1 wherein the stationary magnethas a pair of sidewalls, a pair of end walls, a rear wall, a front endproviding a pair of forwardly facing pole faces at the opposite ends ofthe front end and a forwardly facing support surface extending outwardlyfrom each end wall, the pair of members that provide the frame areL-shaped each have a first leg portion wherein the coil positioningopening is located and a second leg portion providing the surface forguiding the armature movement and wherein the combination includes anelastomeric pad that is positioned between the rear wall on' the magnetand the mounting surface on the shock plate.

1. In an electromagnetically operated switch, the combinationcomprising: an insulating base having a front surface, a metal shockplate having a rear surface mounted on the base in spaced relation tothe front surface of the base, and a front surface providing a mountingsurface, an electromagnet including a stationary magnet, a movablearmature and a magnet coil, and a means for mounting the stationarymagnet on the mounting surface, positioning the magnet coil on thestationary magnet and guiding the armature in its movement intoengagement with the stationary magnet, said means including a pair ofmembers secured to each other and to the front surface of the shockplate to provide a rectangular frame that is spaced forwardly of themounting surface and surrounds the stationary magnet, said members eachhaving an opening therein receiving a projection on the coil forpositioning the coil on the stationary magnet and a surface engaging aportion that is movable with the armature to guide the armature duringits movement.
 2. The combination as recited in claim 1 wherein thestationary magnet has a pair of sidewalls, a pair of end walls, a rearwall, a front end providing a pair of forwardly facing pole faces at theopposite ends of the front end and a forwardly facing support surfaceextending outwardly from each end wall, the pair of members that providethe frame are L-shaped each have a first leg portion wherein the coilpositioning opening is located and a second leg portion providing thesurface for guiding the armature movement and wherein the combinationincludes an elastomeric pad that is positioned between the rear wall onthe magnet and the mounting surface on the shock plate, and anelastomeric pad on each forwardly facing support surface on the magnetthat is positioned between the forwardly facing support surface and thesecond leg portion of one of the pair of L-shaped members.
 3. Thecombination as recited in claim 2 wherein the mounting surface on theshock plate has a pair of opposite sides and a pair of raised spacedsupport surfaces extend from the front surface of the shock plateadjacent each of the opposite sides of the mounting surface.
 4. Thecombination as recited in claim 3 wherein each of the support surfacesare provided by struckout portions in the shock plate that extendforwardly from the front surface of the shock plate.
 5. The combinationas recited in claim 4 wherein each of the struckout portions includes aportion that is inclined relative to the mounting surface and a supportportion that extends in a plane that is parallel and spaced forwardly ofthe mounting surface and each of the support portions has a threadedopening therein which receives a screw to secure the pair of L-shapedmembers to each other and to the front surface of the shock plate. 6.The combination as recited in claim 5 wherein the shock plate is mountedon four posts that extend forwardly of the front surface of the base. 7.The combination as recited in claim 6 wherein the first and the secondleg portions have projections extending therefrom which respectivelyengage the side and the end walls of the statioNary magnet.
 8. Thecombination as recited in claim 2 wherein the shock plate is mounted onfour posts that extend forwardly of the front surface of the base. 9.The combination as recited in claim 2 wherein the first and the secondleg portions have projections extending therefrom which respectivelyengage the side and the end walls of the stationary magnet.
 10. Thecombination as recited in claim 1 wherein the stationary magnet has apair of sidewalls, a pair of end walls, a rear wall, a front endproviding a pair of forwardly facing pole faces at the opposite ends ofthe front end and a forwardly facing support surface extending outwardlyfrom each end wall, the pair of members that provide the frame areL-shaped each have a first leg portion wherein the coil positioningopening is located and a second leg portion providing the surface forguiding the armature movement and wherein the combination includes anelastomeric pad that is positioned between the rear wall on the magnetand the mounting surface on the shock plate.